Invacare Wheelchairs U1 GELL Replacement Battery - 2 Pack UPG # D5722 UB12350 12V 35Ah. Pack of 2 Dimensions: 7.75 inches x 5.19 inches x 7.13 inches. Weight: 22.50 Lbs SLA/AGM maintenance free, spill proof battery Rechargeable battery that can be mounted in any position, resists shocks and vibration 1 Year Warranty